Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd14a8fa2f7b495…

MALICIOUS

PDF

47.8 KB Created: 2020-08-28 18:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29532c75772169f621d1a09c4980d408 SHA-1: 1867ab8b271241c2938052476a9e7aa3660731a3 SHA-256: cdd14a8fa2f7b4955e042e16feb7f0a1da6b406d211f3dbc141f00eba009ac48
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link, directing users to 'ttraff.club'. The document body, though heavily obfuscated, contains text related to 'Saunders nclex pn pdf', suggesting a lure for users seeking study materials. The presence of numerous external links, including benign ones hosted on Shopify, indicates a link farm strategy. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.club/pify?keyword=saunders+nclex+pn+pdf
    • https://cdn.shopify.com/s/files/1/0440/0798/1214/files/creativity_inc._overcoming_the_unseen_forces.pdf
    • https://cdn.shopify.com/s/files/1/0428/9455/7347/files/briket_arang.pdf
    • https://cdn.shopify.com/s/files/1/0435/5905/9615/files/61976920740.pdf
    • https://cdn.shopify.com/s/files/1/0435/8258/7039/files/jukenutu.pdf
    • https://static.usrfiles.com/ugd/b8c837_affb6a93945c4d549595d45de0a7bee3.pdf
    • https://static.usrfiles.com/ugd/b8c837_bffe960db9a440b49904ed44d1a28be5.pdf
    • https://cdn.shopify.com/s/files/1/0435/3523/7269/files/cciso_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0434/5122/0120/files/repirimusikumulizaja.pdf
    • https://cdn.shopify.com/s/files/1/0435/8832/1437/files/aix_command_reference.pdf
    • https://cdn.shopify.com/s/files/1/0428/6034/7551/files/64831146719.pdf
    • https://cdn.shopify.com/s/files/1/0438/0783/4272/files/migojajozoxidix.pdf
    • https://cdn.shopify.com/s/files/1/0430/0183/9775/files/mudakedez.pdf
    • https://cdn.shopify.com/s/files/1/0435/2271/9912/files/gesopeselenige.pdf
    • https://cdn.shopify.com/s/files/1/0432/1522/4996/files/sapevuzibelulej.pdf
    • https://cdn.shopify.com/s/files/1/0430/9427/8293/files/19124130238.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b9b.bin
291e7c86e38dea5399b7849d9724d95f9ee502006458da25d40e7aa34c1b14bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B9B 4964 bytes
font_01_sfnt_off00007c7a.bin
57a34ddec2cc9326b6dce58f9b70456a75ff097a02fbdf39e3e12ade160793f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C7A 12148 bytes
font_02_sfnt_off0000a3fb.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3FB 4324 bytes

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